Add Technitium backup sync automation

technitium-serenity/.env.example

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+TZ=America/Chicago
+LAN_INTERFACE=br0
+LAN_SUBNET=10.5.30.0/24
+LAN_GATEWAY=10.5.30.1
+TECHNITIUM_BIND_IP=10.5.30.10
+APPDATA_TECHNITIUM_ROOT=/mnt/user/appdata/technitium-serenity/data
+DNS_SERVER_DOMAIN=technitium-serenity.home.paccoco.com
+DNS_SERVER_ADMIN_PASSWORD=CHANGE_ME
+DNS_SERVER_SSO_ENABLED=false
+DNS_SERVER_SSO_AUTHORITY=
+DNS_SERVER_SSO_CLIENT_ID=
+DNS_SERVER_SSO_CLIENT_SECRET=
+DNS_SERVER_SSO_METADATA_ADDRESS=
+DNS_SERVER_SSO_SCOPES=openid profile email groups
+DNS_SERVER_SSO_ALLOW_SIGNUP=true
+DNS_SERVER_SSO_ALLOW_SIGNUP_ONLY_FOR_MAPPED_USERS=true
+DNS_SERVER_SSO_GROUP_MAP=authentik Admins=Administrators
+DNS_SERVER_BLOCK_LIST_URLS=https://big.oisd.nl/